Poly (phenylene ether) resin composition, prepreg, and laminated sheet

1. A laminated sheet prepared by piling a prepreg and copper foil(s) one over the other under heat-pressing,

wherein the prepreg is prepared by impregnating a poly(phenylene ether) resin composition into a substrate and semi-curing a resulting impregnated substrate,

wherein the poly(phenylene ether) resin composition comprises a poly(phenylene ether) and a crosslinking curing agent,

wherein the polyphenylene ether is represented by the following formula (I), and the number averaged molecular weight thereof is in a range of 1,000 to 7,000

wherein, X is an aryl group; (Y) m is a polyphenylene ether moiety; m is an integer of 1 to 100; Z is a para- or meta-phenylene group, an oxygen atom or a sulfur atom; and when Z is a oxygen atom or a sulfur atom, n is an integer of 1 to 6; when Z is a para- or meta-phenylene group, n is 1; R 1 to R 3 each independently is a hydrogen atom, an alkyl group, an alkenyl group or alkynyl group; and q is an integer of 1 to 4.

2. The laminated sheet according to claim 1 , wherein said copper foil has a surface roughness of 2 μm or less, and the surface thereof facing the prepreg is treated with zinc or a zinc alloy and at the same time coupled with a silane coupling agent having a vinyl group.

3. The laminated sheet according to claim 1 , wherein Z is a para or meta-phenylene group and n is 1.

4. The laminated sheet according to claim 1 , wherein Z is an oxygen atom and n is 2.

5. The laminated sheet according to claim 1 , wherein (Y) m is represented by the following formula (II)

[wherein, R 4 to R 7 each independently is a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group or an alkenyl carbonyl group; and m is an integer of 1 to 100.]

6. The laminated sheet according to claim 5 , further comprising a poly(phenylene ether) having a number averaged molecular weight in a range of 9,000 to 18,000.

7. The laminated sheet according to claim 1 , wherein the portion represented by the following formula is selected from p-ethenylbenzyl and m-ethenylbenzyl groups

8. The laminated sheet according to claim 1 , further comprising a poly(phenylene ether) having a number averaged molecular weight in a range of 9,000 to 18,000.

9. The laminated sheet according to claim 1 , wherein the mass ratio represented by [the poly(phenylene ether)]/(the crosslinking curing agent) is 30/70 to 90/10.

10. The laminated sheet according to claim 1 , further comprising a poly(phenylene ether) having a number averaged molecular weight in a range of 9,000 to 18,000.

11. The laminated sheet according to claim 1 , wherein both p-ethenylbenzyl and m-ethenylbenzyl groups are present.

12. The laminated sheet according to claim 1 , wherein said crosslinking curing agent is trialkenyl isocyanurate.

13. The laminated sheet according to claim 1 , wherein said crosslinking curing agent is a tri- to penta-functional (meth)acrylate compound.

14. The laminated sheet according to claim 1 , further comprising at least one kind of organic or inorganic filler.

15. The laminated sheet according to claim 14 , wherein said filler has an average diameter of 10 μm or less.

16. The laminated sheet according to claim 14 , wherein said filler is a hollow substance.

17. The laminated sheet according to claim 14 , wherein said filler is a substance prepared from a fluorine-containing compound.

18. The laminated sheet according to claim 1 , further comprising a flame retardant.

19. The laminated sheet according to claim 18 , wherein said flame retardant is a bromine compound having a bromine content of 8 to 20 mass % with respect to the total amount of the composition.